Bump Microsoft.AspNetCore.SpaServices from 2.2.0 to 2.2.7 in /src/demo11

[dependabot[bot]]

Bumps Microsoft.AspNetCore.SpaServices from 2.2.0 to 2.2.7.

Release notes

Sourced from Microsoft.AspNetCore.SpaServices's releases.

.NET Core 2.2.7

• Release Notes
• Download and Install

Repos

• Core
• CoreCLR
• CoreFX
• Core-Setup
• CLI
• CLI
• CLI
• ASP

.NET Core 2.2.6

• Release Notes
• Download and Install

Repos

• Core
• CoreCLR
• CoreFX
• Core-Setup
• CLI
• ASP

Commits

• be0a4a7 Merged PR 2631: Fix patch config in 2.2
• e1426f6 Merged PR 2582: Fixing merge conflict between release/2.2 and internal/releas...
• fc65b4f Merged PR 2264: Fix encoding used in JS generated by prerenderer
• 124b96b Merged PR 2564: Update PatchConfig.props for 2.2.7
• c950fdb Merge in 'release/2.2' changes
• c809b66 Catch all exceptions from Exit shutdown (#12518)
• 9fa709a Merge in 'release/2.2' changes
• 9feeb66 Merge branch 'release/2.1' into release/2.2
• f7a7c98 Ship templates in 2.1 (#12540)
• cb0211d Merge in 'release/2.2' changes
• Additional commits viewable in compare view

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